Residual-current circuit breaker with bipolar short-circuit protection function

Abstract

The invention relates to the technical field of circuit breakers, in particular to a residual-current circuit breaker with a bipolar short-circuit protection function, which comprises an outer cover, a bottom shell, a bipolar short-circuit electromagnetic tripping mechanism and a residual-current control electronic circuit board. The bottom of the outer cover is detachably connected with a bottom shell; a switch handle is movably connected in the bottom shell and a mainboard is inserted in the bottom shell; the electromagnetic tripping mechanism comprises a coil framework, a coil, a fixed bracket and an iron core and is used for triggering mechanical tripping; the mechanical tripping mechanisms are distributed on the two sides and the bottom side of the switch handle, and a circuit is cut off through a fixing screw, a bimetallic strip, a movable contact point and a static contact point. Through the linkage design of the electromagnetic tripping mechanism and the mechanical tripping mechanism and in combination with a bipolar linkage structure, a bipolar linkage protection function is achieved when a circuit is short-circuited, the problem that a traditional electric leakage circuit breaker does not act when the circuit is short-circuited is solved, and the service life of the electric leakage circuit breaker is prolonged. The method has the advantage of improving the overall reliability of short-circuit protection.

Description

Technical Field

[0001] The present invention relates to the technical field of circuit breakers, in particular to a leakage circuit breaker with a bipolar short-circuit protection function. Background Art

[0002] The leakage protector, also known as the leakage switch handle, is mainly used to protect equipment from leakage faults and to protect people from fatal electric shock. It has overload and short-circuit protection functions and can be used to protect lines or motors from overload and short circuit. It can also be used as an infrequent switching start of the line under normal circumstances.

[0003] Existing leakage circuit breakers lack long-delay overload and short-delay short-circuit protection. Short-circuit protection is provided by thermal-magnetic tripping. Existing leakage circuit breakers are mostly thermal tripping or electromagnetic tripping. Thermal tripping uses the current delay, heat and deformation, to trigger the tripping transmission mechanism; magnetic tripping uses the short-circuit current of the electromagnetic coil to instantly trigger the bimetallic strip, causing the trip. Thermal tripping can only provide two stages of protection. The action value has a large error and can be adjusted slightly, but is significantly affected by the environment. While magnetic tripping can provide multiple stages of protection, it is easily damaged, has a slow short-circuit protection response, and poor synchronization between internal structures. Some traditional leakage protectors even fail to operate when a short circuit occurs. Therefore, a leakage circuit breaker is needed to solve this problem. Summary of the Invention

[0004] The purpose of this application is to provide a leakage circuit breaker with bipolar short-circuit protection function and its mechanical tripping mechanism and electromagnetic tripping mechanism, which have the advantages of improving the short-circuit protection response speed, enhancing the synchronization of the tripping mechanism action and improving the overall reliability.

[0005] The leakage circuit breaker with bipolar short-circuit protection provided by the present invention adopts the following technical solution: A leakage circuit breaker with double-pole short-circuit protection, including: The outer cover has a bottom detachably connected to the bottom shell, a switch handle is movably connected to the bottom shell, the switch handle is rotatably connected to the outer cover and extends to the outside of the outer cover, a mainboard is inserted into the bottom shell, and a second control mechanism of the switch handle is provided on the inside of the bottom shell; An electromagnetic tripping mechanism is provided on one side of the switch handle for cutting off the circuit. The electromagnetic tripping mechanism includes a coil bobbin, a coil is wound around the outside of the coil bobbin, one end of the coil bobbin is fixedly connected to a fixing bracket, the fixing bracket is fixedly connected to the mainboard, an iron core is slidably connected to the coil bobbin, one end of the iron core is detachably connected to a lock buckle, the bottom end of the lock buckle is slidably connected to the bottom shell, a magnetic shoe is fixedly connected to the fixing bracket, one end of the fixing bracket is located in the coil bobbin, and the other end extends through the mainboard to the side of the mainboard away from the coil bobbin; The mechanical tripping mechanism is synchronously linked with the electromagnetic tripping mechanism, and the mechanical tripping mechanism is distributed on both sides and the bottom side of the switch handle. A control module linked with the mechanical tripping mechanism is provided at the bottom of the switch handle.

[0006] Furthermore, the present application also proposes that the mechanical tripping mechanism includes a fixing screw, a bimetallic strip and a moving contact, the fixing screw is detachably connected to the inner wall of the bottom shell, one end of the bimetallic strip is fixedly connected to the fixing screw, one end of the moving contact is connected to the fixing screw, and the other end is fixedly connected to a moving contact pole, a bolt is detachably connected inside the bottom shell, a static contact is fixedly connected to the bottom of the bolt, and a static contact pole used in conjunction with the moving contact pole is fixedly connected to the static contact.

[0007] Furthermore, the present application also proposes that the bimetallic strip, the moving contact and the static contact are all elastic.

[0008] Furthermore, the present application also proposes that the control module includes a connecting iron sheet and a pressure plate, the connecting iron sheet is arranged at the bottom of the switch handle, and the bottom of the connecting iron sheet is provided with a jump buckle rotatably connected to the bottom shell, and the pressure plate is provided with two and is slidingly connected to the bottom shell, and the two pressure plates are respectively located on the top sides of the moving contacts on both sides, the jump buckle is located on the top sides of the two pressure plates, and a reset spring is fixedly connected to the bottom side of one end of the pressure plate.

[0009] Furthermore, the present application also proposes that the top end of the pressure plate is integrally fixedly connected with a top block, and the top end of the top block abuts against the jump buckle.

[0010] Furthermore, the present application also proposes that the second control mechanism includes an inner frame, which is fixedly connected to the inner wall of the bottom shell, and the two sides of the inner frame are rotatably connected to a seesaw, the bottom of the inner frame is rotatably connected to a driving rod fixedly connected to the seesaw, the middle part of the inner frame is rotatably connected to a rotating block, the rotating block rotates synchronously with the driving rod, the top of the inner frame is rotatably connected to a latch, and the rotating block is provided with a groove that engages with the latch.

[0011] Furthermore, the present application also proposes that a connecting rod is movably connected between the latch and the switch handle, a translation push rod is fixedly connected to the bottom of the lock, and the translation push rod is in dynamic contact with the rocker.

[0012] To sum up, the present application provides a leakage circuit breaker with bipolar short-circuit protection function and its mechanical tripping mechanism and electromagnetic tripping mechanism, which realize short-circuit short-delay protection and bipolar synchronous tripping function through the linkage design of the electromagnetic tripping mechanism and the mechanical tripping mechanism, and realize the function of bipolar linkage protection when a short circuit occurs in the circuit, solving the problem that the traditional leakage circuit breaker does not operate when a short circuit occurs in the circuit, and has the advantage of improving the overall reliability of short-circuit protection. In addition, when a short circuit occurs, the moving contact pole and the static contact pole are quickly separated, solving the problems of response delay, asynchronous action and poor long-term reliability, and has the advantages of improving the short-circuit protection response speed, enhancing the synchronization of the tripping mechanism action and improving the overall reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 2 is a front view structural diagram of the leakage circuit breaker with bipolar short-circuit protection function in this embodiment.

[0014] Figure 2 yes Figure 1 Schematic diagram of the cross-sectional structure at AA in the middle.

[0015] Figure 3 1 is a schematic diagram of the structure of the leakage circuit breaker with bipolar short-circuit protection function in this embodiment when the cover is removed.

[0016] Figure 4 yes Figure 3 Schematic diagram of the cross-sectional structure at BB in the middle.

[0017] Figure 5 3D schematic diagram of the internal partial structure of the leakage circuit breaker with bipolar short-circuit protection function in this embodiment.

[0018] Figure 6 2 is a schematic structural diagram of the second control mechanism of the leakage circuit breaker with bipolar short-circuit protection function in this embodiment.

[0019] Figure 7 This is a schematic diagram of the three-dimensional structure of the second control mechanism of the leakage circuit breaker with bipolar short-circuit protection function in this embodiment from another perspective.

[0020] Description of reference numerals: 1. Outer cover; 11. Bottom shell; 12. Switch handle; 121. Connecting rod; 13. Connecting iron sheet; 14. Main board; 15. Trip button; 16. Pressure plate; 17. Reset spring; 2. Electromagnetic tripping mechanism; 21. Coil skeleton; 22. Fixed bracket; 23. Coil; 24. Iron core; 25. Lock; 251. Translation push rod; 26. Magnetic shoe; 3. Mechanical tripping mechanism; 31. Fixing screw; 32. Bimetallic strip; 33. Moving contact; 34. Moving contact pole; 35. Static contact; 36. Static contact pole; 4. Inner frame; 41. Rocker; 42. Driving rod; 43. Lock; 44. Rotating block. DETAILED DESCRIPTION

[0021] The following is combined with Figure 1-Figure 7 The present invention is described in further detail.

[0022] The embodiment of the present invention discloses a leakage circuit breaker with a bipolar short-circuit protection function.

[0023] It should be noted that, in the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0024] Reference Figure 1-Figure 7 , this application proposes a leakage circuit breaker with a bipolar short-circuit protection function, comprising: The outer cover 1 has a bottom detachably connected to a bottom shell 11, a switch handle 12 movably connected to the bottom shell 11, the switch handle 12 is rotatably connected to the outer cover 1 and extends to the outside of the outer cover 1, a main board 14 is inserted into the bottom shell 11, and a second control mechanism of the switch handle 12 is provided inside the bottom shell 11; An electromagnetic tripping mechanism 2 is provided on one side of the switch handle 12 for cutting off the circuit. The electromagnetic tripping mechanism 2 includes a coil bobbin 21, a coil 23 is wound around the outside of the coil bobbin 21, one end of the coil bobbin 21 is fixedly connected to a fixing bracket 22, the fixing bracket 22 is fixedly connected to the main board 14, an iron core 24 is slidably connected to the coil bobbin 21, one end of the iron core 24 is detachably connected to a lock buckle 25, the bottom end of the lock buckle 25 is slidably connected to the bottom shell 11, a magnetic shoe 26 is fixedly connected to the fixing bracket 22, one end of the fixing bracket 22 is located in the coil bobbin 21, and the other end extends through the main board 14 to the side of the main board 14 away from the coil bobbin 21; The mechanical tripping mechanism 3 is synchronously linked with the electromagnetic tripping mechanism 2 and is distributed on both sides and the bottom of the switch handle 12 . A control module linked with the mechanical tripping mechanism 3 is provided at the bottom of the switch handle 12 .

[0025] The detachable connection between the outer cover 1 and the bottom shell 11 facilitates maintenance of internal components, for example, by using snaps or screws. A coil 23 is wound around the outside of the coil bobbin 21 of the electromagnetic tripping mechanism 2. When a short-circuit current passes through, the iron core 24 is driven by the magnetic force of the coil 23 to pull the lock 25, triggering the mechanical tripping. The switch handle 12 jumps, turning the mechanical tripping mechanism 3 into an open circuit state, that is, the moving contact pole 34 and the static contact pole 36 are separated, cutting off the circuit. The pressure plate 16 of the control module cooperates with the switch handle 12. Specifically, the switch handle 12 controls the downward pressure of the pressure plate 16 through the tripping button 15. When the switch handle 12 rotates, it will generate pressure on the tripping button 15, which in turn transmits the pressure to the pressure plate 16. When the tripping occurs, the return spring 17 provides an upward force to lift the pressure plate 16 back to its initial position.

[0026] Specifically, when a short circuit occurs, the coil 23 of the electromagnetic trip mechanism 2 generates a magnetic field, driving the iron core 24 to slide along the coil bobbin 21. The iron core 24 pulls the lock 25, causing the switch handle 12 to jump to the OFF position. At this point, the pressure on the trip 15 from the switch handle 12 is reduced, and the return spring 17 pushes up the pressure plate 16, disengaging the moving contact pole 34 from the static contact pole 36, thereby quickly disconnecting the circuit. The second control mechanism at the bottom of the switch handle 12 releases the lock on the switch handle 12, and in conjunction with the action of the return spring 17, the switch handle 12 jumps to the OFF position. The mainboard 14 monitors the circuit state and adjusts the response threshold through the electromagnetic trip mechanism 2. For example, the mainboard 14 can integrate a current sensor and a logic control unit. The number of turns of the coil 23 can be adjusted according to the user's threshold setting. The magnetic shoe 26 can also be configured to enhance the attraction force generated by the coil 23, facilitating the rapid movement of the iron core 24, thus ensuring a fast response to a short circuit.

[0027] Through the above technical solution, this application significantly reduces the probability of false operation through the dual response mechanism of electromagnetic drive and mechanical linkage when a short circuit occurs. At the same time, the split design avoids protection failure caused by failure of a single component, the elastic reset structure improves the service life of the tripping mechanism, and the main board 14 integrated control module enhances action consistency, which is suitable for industrial scenarios with high requirements for short-circuit protection accuracy.

[0028] Reference Figure 1-Figure 7The present application further proposes that the mechanical tripping mechanism 3 includes a fixing screw 31, a bimetallic strip 32 and a moving contact 33. The fixing screw 31 is detachably connected to the inner wall of the bottom shell 11, one end of the bimetallic strip 32 is fixedly connected to the fixing screw 31, one end of the moving contact 33 is connected to the fixing screw 31, and the other end is fixedly connected to the moving contact pole 34. A bolt is detachably connected inside the bottom shell 11, and a static contact 35 is fixedly connected to the bottom of the bolt. A static contact pole 36 used in conjunction with the moving contact pole 34 is fixedly connected to the static contact 35. The bimetallic strip 32, the moving contact 33 and the static contact 35 are all elastic.

[0029] Among them, the fixing screw 31 refers to a metal component used to fix the bimetallic strip 32 and the moving contact 33, and can be specifically implemented by a columnar structure with threads. It cooperates with the slot of the bottom shell 11 to form a detachable connection, which is convenient for quick disassembly and assembly during maintenance. The moving contact 33 refers to a component of elastic conductive material, and can be specifically implemented by a phosphor bronze sheet. Its elastic deformation ability enables the moving contact pole 34 and the static contact pole 36 to automatically separate after tripping, while ensuring stable contact when the circuit is turned on. Among them, the static contact 35 refers to a fixed conductive component that cooperates with the moving contact 33, and can be specifically implemented by a copper alloy plate. It is fixed in the bottom shell 11 by bolts, and the static contact pole 36 is welded to the surface of the static contact 35 to form a stable circuit connection point.

[0030] Specifically, when electromagnetic trip mechanism 2 is triggered, coil 23 is energized to generate a magnetic field, causing iron core 24 to slide along coil bobbin 21. Iron core 24 pulls lock catch 25 back, simultaneously driving the movement of the second control mechanism, which in turn controls the rotation of switch handle 12. The pressure on movable contact 33 is reduced, and it rebounds under the action of return spring 17, separating movable contact pole 34 from stationary contact pole 36, thus disconnecting the circuit. The removable connection between setscrew 31 and base housing 11 allows for rapid replacement of damaged components after a fault, while the elastic properties of movable contact 33 and stationary contact 35 absorb mechanical shock, preventing malfunction due to vibration.

[0031] Through the above technical solution, the present application can cut off the circuit by quickly separating the moving contact pole 34 and the static contact pole 36, thereby improving the response speed of the short-circuit protection action, ensuring that the moving contact pole 34 and the static contact pole 36 are completely separated after tripping, avoiding the residual arc causing a secondary short circuit, and at the same time simplifying the maintenance process of the tripping mechanism and reducing the overall replacement cost caused by component damage.

[0032] Reference Figures 1-6The present application further proposes that the control module includes a connecting iron sheet 13 and a pressure plate 16. The connecting iron sheet 13 is arranged at the bottom of the switch handle 12. The bottom of the connecting iron sheet 13 is provided with a jumper 15 rotatably connected to the bottom shell 11. Two pressure plates 16 are provided and are slidably connected to the bottom shell 11. The two pressure plates 16 are respectively located on the top sides of the moving contacts 33 on both sides. The jumper 15 is located on the top sides of the two pressure plates 16. A reset spring 17 is fixedly connected to the bottom side of one end of the pressure plate 16. The top of the pressure plate 16 is integrally fixedly connected with a top block, and the top of the top block abuts against the jumper 15.

[0033] Among them, the connecting iron sheet 13 refers to the supporting components arranged on both sides of the bottom of the switch handle 12, which can be specifically implemented by an elastic metal plate, and is used to provide support force and transmit mechanical movement when the switch handle 12 is actuated. The trip button 15 can be specifically made of elastic metal material, connected to the bottom shell 11 through a torsion spring, and is used to provide a reverse force when the switch handle 12 is reset. The pressure plate 16 refers to an elastic component arranged on the top of the moving contact 33, which uses its elastic deformation ability to apply pressure to the moving contact 33. The reset spring 17 refers to an elastic element fixed to the bottom of the pressure plate 16, which is used to provide a restoring force to return the pressure plate 16 to its position upward during the tripping action.

[0034] Specifically, when the switch handle 12 is closed, the trip latch 15 applies pressure to the pressure plates 16 on both sides, maintaining contact between the pressure plates 16 and the moving contact 33, thereby bringing the moving contact pole 34 into contact with the stationary contact pole 36. In the event of a trip, the trip latch 15 resets, reducing the pressure on the pressure plates 16. The pressure plates 16 move upward under the force of the return spring 17. At this point, the pressure plates 16 follow the movement due to elastic deformation, reducing the pressure on the moving contact 33, thereby disengaging from the stationary contact 35 and achieving the power-off function. Furthermore, the disengagement of the moving contact 33 from the stationary contact 35 is faster than with traditional purely mechanical tripping and power-off. The separation of the moving contact 33 from the stationary contact 35 is completed the moment the switch handle 12 is unlocked, achieving the power-off protection function. The trip latch 15 is reversed due to the action of the torsion spring. After the tripping action is completed, the return spring 17 pushes the pressure plates 16 back to their initial position. During this process, the synergistic action of the elastic components ensures the continuity and stability of the control mechanism during the tripping and reset actions.

[0035] Compared to existing technologies, existing leakage circuit breakers generally use a single rigid transmission component to control the tripping action, lacking elastic elements for buffering, which can easily lead to reset difficulties or delayed operation. This solution uses the combined structure of an elastic pressure plate 16 and a reset spring 17 to achieve flexible force transmission during the tripping process. At the same time, the linkage mechanism between the tripping button 15 and the torsion spring effectively solves the reset stuck problem.

[0036] Through the above technical solution, the present application can accurately control the timing of the trip mechanism's operation, avoid component wear caused by rigid collisions, and improve the reliability of the reset operation. The combined design of the elastic pressure plate 16 and the reset spring 17 ensures that stable mechanical performance can be maintained after multiple trips, thereby extending the service life of the control mechanism.

[0037] Reference Figures 1-6 The present application further proposes that the second control mechanism includes an inner frame 4, which is fixedly connected to the inner wall of the bottom shell 11, and the two sides of the inner frame 4 are rotatably connected to the rocker 41. The bottom of the inner frame 4 is rotatably connected to a driving rod 42 fixedly connected to the rocker 41, and the middle part of the inner frame 4 is rotatably connected to a rotating block 44. The rotating block 44 rotates synchronously with the driving rod 42. The top of the inner frame 4 is rotatably connected to a latch 43, and a groove that engages with the latch 43 is provided on the rotating block 44. A connecting rod 121 is movably connected between the latch 43 and the switch handle 12. The bottom of the lock buckle 25 is fixedly connected to a translation push rod 251, and the translation push rod 251 is in dynamic contact with the rocker 41.

[0038] Specifically, during operation, when a short circuit occurs, the iron core 24 drives the lock 25 to retract, thereby driving the translation push rod 251 to slide, the translation push rod 251 contacts the rocker 41, drives the rotating block 44 to rotate, and the lock 43 disengages from the groove. The switch handle 12 jumps to off under the action of the torsion spring of the connecting rod 121, disconnecting the circuit and realizing mechanical tripping. Under normal operation, the translation push rod 251 does not contact the rocker 41, and the lock 43 is locked in the rotating block 44.

[0039] The above are all preferred embodiments of the present invention, and are not intended to limit the scope of protection of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the scope of protection of the present invention.

Claims

1. A leakage circuit breaker with bipolar short-circuit protection function, characterized in that: include: An outer cover (1) has a bottom detachably connected to a bottom shell (11), a switch handle (12) movably connected to the bottom shell (11), the switch handle (12) being rotatably connected to the outer cover (1) and extending to the outside of the outer cover (1), a main board (14) being inserted into the bottom shell (11), and a second control mechanism for the switch handle (12) being provided on the inside of the bottom shell (11); An electromagnetic tripping mechanism (2) is provided on one side of the switch handle (12) for cutting off the circuit, the electromagnetic tripping mechanism (2) comprising a coil frame (21), a coil (23) being wound around the outer side of the coil frame (21), one end of the coil frame (21) being fixedly connected to a fixing bracket (22), the fixing bracket (22) being fixedly connected to the main board (14), an iron core (24) being slidably connected inside the coil frame (21), one end of the iron core (24) being detachably connected to a lock buckle (25), the bottom end of the lock buckle (25) being slidably connected to the bottom shell (11), a magnetic shoe (26) being fixedly connected to the fixing bracket (22), one end of the fixing bracket (22) being located inside the coil frame (21), and the other end of the fixing bracket (22) being passed through the main board (14) and extending to a side of the main board (14) away from the coil frame (21); A mechanical tripping mechanism (3) is synchronously linked with the electromagnetic tripping mechanism (2), and the mechanical tripping mechanism (3) is distributed on both sides of the switch handle (12). A control module linked with the mechanical tripping mechanism (3) is provided at the bottom of the switch handle (12).

2. The leakage circuit breaker with bipolar short circuit protection function according to claim 1, characterized in that: The mechanical tripping mechanism (3) comprises a fixing screw (31), a bimetallic strip (32) and a moving contact (33); the fixing screw (31) is detachably connected to the inner wall of the bottom shell (11); one end of the bimetallic strip (32) is fixedly connected to the fixing screw (31); one end of the moving contact (33) is connected to the fixing screw (31); the other end is fixedly connected to a moving contact pole (34); a bolt is detachably connected inside the bottom shell (11); a static contact (35) is fixedly connected to the bottom of the bolt; and a static contact pole (36) used in conjunction with the moving contact pole (34) is fixedly connected to the static contact (35).

3. The leakage circuit breaker with bipolar short circuit protection function according to claim 2, characterized in that: The bimetallic strip (32), the moving contact (33) and the static contact (35) are all elastic.

4. The leakage circuit breaker with bipolar short circuit protection function according to claim 1, characterized in that: The control module comprises a connecting iron sheet (13) and a pressure plate (16), wherein the connecting iron sheet (13) is arranged at the bottom of the switch handle (12), and a trip button (15) rotatably connected to the bottom shell (11) is arranged at the bottom of the connecting iron sheet (13), and two pressure plates (16) are provided and slidably connected to the bottom shell (11), and the two pressure plates (16) are respectively located on the top sides of the moving contacts (33) on both sides, and the trip button (15) is located on the top sides of the two pressure plates (16), and a reset spring (17) is fixedly connected to the bottom side of one end of the pressure plate (16).

5. The leakage circuit breaker with bipolar short circuit protection function according to claim 4, characterized in that: The top end of the pressing plate (16) is integrally fixedly connected with a top block, and the top end of the top block abuts against the jump buckle (15).

6. The leakage circuit breaker with bipolar short circuit protection function according to claim 1, characterized in that: The second control mechanism comprises an inner frame (4), the inner frame (4) being fixedly connected to the inner wall of the bottom shell (11), the two sides of the inner frame (4) being rotatably connected to a seesaw (41), the bottom of the inner frame (4) being rotatably connected to a driving rotating rod (42) fixedly connected to the seesaw (41), the middle of the inner frame (4) being rotatably connected to a rotating block (44), the rotating block (44) and the driving rotating rod (42) being rotated synchronously, the top of the inner frame (4) being rotatably connected to a latch (43), the rotating block (44) being provided with a groove engaging with the latch (43).

7. The leakage circuit breaker with bipolar short circuit protection function according to claim 6, characterized in that: A connecting rod (121) is movably connected between the latch (43) and the switch handle (12), a translation push rod (251) is fixedly connected to the bottom of the lock catch (25), and the translation push rod (251) is in dynamic contact with the rocker (41).

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